In short, trans are nutjobs. The bathroom is about the last place I want to be alone with a male nutjob. These unfortunate, but seriously disturbed individuals belong on the 5th floor in a straight jacket. Not in a women’s bathroom.
Source: three guesses. I'm not gonna link to that snake pit again, but you can find it, if you haven't figured it out already, via Kim, or antiprincess, or Lucy, or Andrea.
p.s. Confidential to Guess Who: No, you creep, since you were wondering: that's not why I hate you.